231898493 has 2 divisors, whose sum is σ = 231898494. Its totient is φ = 231898492.

The previous prime is 231898463. The next prime is 231898523. The reversal of 231898493 is 394898132.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (231898463) and next prime (231898523).

It can be written as a sum of positive squares in only one way, i.e., 227496889 + 4401604 = 15083^2 + 2098^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231898493 is a prime.

It is a super-2 number, since 2×231898493² = 107553822111342098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231898463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115949246 + 115949247.

It is an arithmetic number, because the mean of its divisors is an integer number (115949247).

Almost surely, 2^231898493 is an apocalyptic number.

It is an amenable number.

231898493 is a deficient number, since it is larger than the sum of its proper divisors (1).

231898493 is an equidigital number, since it uses as much as digits as its factorization.

231898493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 47.

The square root of 231898493 is about 15228.2137166511. The cubic root of 231898493 is about 614.3737366435.

The spelling of 231898493 in words is "two hundred thirty-one million, eight hundred ninety-eight thousand, four hundred ninety-three".